Smoke-preventer



B. L. AMES.

SMOKE PREVENTEH.

APPLICATION F1 LED111NE12.1915.

A `1,309,172. Patented July 8,1919.

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A ys- -rn coLumnlA PLANounAPn co.. WASHINGTON. b. c.,

UNITED sTATEs PATENT oEEioE.

'BRADFORD L. AMES, OF BOSTON, MASSACHUSETTS.

SMOKE-PREVENTER.

Application led June 12, 1915.

To all whom t may concern.'

Be it known that I, BRADFORD L. AMES, a citizen of the United States, residing at Boston, county of Suffolk, State of Massachusetts, have invented a certain new and useful Improvement in Sinoke-Preventers, of which the following'is a specification, reference being had therein to the accompanying drawings.

My invention relates to smoke preventers of the type employed in connection with coal fed boiler furnaces to introduce a supply of air to the fire for a' limited period after firing. It has for its object the production of an improved form of air conduit and damper for the introduction of air to the lire and is particularly adapted to be employed in connection with an auto-4 matic smoke preventerr shown and described in United States Fatent No. 1,166,880, dated Jian. 4, 1916,A granted to me.

Smoke preventers of the class to which my invention relates are particularly designed so th at they may be readily applied te any well known type of boiler furnace with'as little expense and delay as possible. I have found that the air. conduit and air damper are one of the chief diliiculties in the installation of these devices and the object of my present invention therefore is to further increase the flexibility of the device and decrease the -diiiiculty of its installation by producing a damper and air conduit which is so constructed that it may loe adapted to any well known type of boiler furnace. Y

My invention will be fully understood from the following description when taken in connection with the accompanying drawingsand the novel features thereof will be pointed out and clearly defined in the claims at the close of the specification.

,In the drawings, Figure 1 is an elevation partly broken away showing a boiler furnace front provided with a smoke preventer embodying my invention.

Fig. 2 is a section on line Q-Q of Fig. 1.

Fig. 3 lis a section on line 3&3 of Fig. 1.

Fig. 11 is a rear elevation of a portion of a front boilerplate showing an air conduit in longitudinal section adapted te be employed in connection with five steam nozzles and showing a pair of air boxes in dotted lines in connection therewith.

Fig. 5 is a detail plan View of the rack and Specification of Letters Patent.

Patented J 1y S, 1919.

Serial No. 33,829.

pinion mechanism for operatingthe valve of the steam supply pipe.

Having reference to the drawings there is shown at 11 the front plate of a boiler provided with furnace doors 12 which are arranged to operate a smoke preventer of the type for which the device embodying my invention is particularly designed. rThis consists of a steam pipe 13, cont-rolled by a Valve 14; connected by a universal joint l5 with an upright rod 16 revolubly mounted in the guides 17 with which the bracket 18 is provided. In connection with the pipe 13 are nozzles 19 which are secured to the plate 11 as will be hereinafter described. The rod 16, which operates the valve 14, is controlled by a horizontal slide rod 2O having a rack 21 which cooperates with a pinion 22 secured to the rod 16. The rack 21 is held in engagement with the pinion E22 by means of guide rolls 23 secured to the lower guide 17. By this construction the slide rod 20 may be given a longitudinal movement to rotate the upright rod 16 and thereby control the valve 14.

At the other end of the slide rod 20 is a rack 25 which engages a pinion 26 secured to the stem 27 rotatably mounted in guides 2S with which the bracket 29 is provided. Sprockets 30 are loosely mounted von the stem 27 and rod 16 and are provided with pins 31 which are adapted to engage with collars rigidly mounted on the stem and rod. Sprockets 83 are secured to hinge pins 84 with which each of the doors 12 is provided and are connected with the sprockets 30 by chains 35. The parts are arranged so Y that when either of the furnace doors is opened the slide rod 2O will be moved to the right and the valve 14 opened to admit steam to the nozzles 19, and when the fu rnaee doors 12 are closed the position of the slide rod 2O will not be al'l'eeted, all as more fully described in the application referred to. i.

A suitable automatic device for moving the rod 20 in the opposite direction from which it is moved by opening the doors 12 is provided. This is of a type well known to those skilled in theV art and therefore is not shown in detail. It consists of a cylinder 36 in which is a piston, not shown, secured to a stem 37 and provided with a one-way valve which is arranged to permit the free passage of liquid in the cylinder through the piston in one direction only. A spring also not shown surrounding the piston rod within the cylinder tends to move the rod and piston to the left as shown in Fig 1 and causes oil or like liuid in the cylinder to pass slowly from one end of the cylinder to the other by way of the by-pass pipe 38 controlled iby a suitable valve 39. In this manner steam in the pipe 13 is cut off from the nozzles 19 after a predetermined period.

The device embodying my invention consists of an air conduit and damper the former of which is located at the inner side of the front plate 11 of the boiler and is sufficiently removed from the exterior of the boiler to eliminate all objectionable noise resulting from the passage of air and steam into the fire box, The conduit comprises a plurality of sections 407 41 and 42 as shown in Fig. 1. Sections 40 and 41 are provided each with an enlarged portion 43 which is adapted to receive the opposite end 44 of an adjacent section and make a snug fit therewith. The end section is preferably of uniform width throughoutj and both end sections 40 and 42 are closed at their outer ends. The sections are of rectangular shape in cross-section so that they may be located closely adjacent the inner surface of the front plate 11 and at the same time 4be capable of providing for the passage of a relatively large quantity of air without extending an undue amount rearwardly from the plate 1l. The sections are each provided with a hole 46 surrounded by a boss 47 into which a nozzle 19 is screwed. A nipple 48 passes through the front boiler plate 11. The rear end of said nipple is screwed into said boss 47, and its front end is secured to the rear end of a pipe section 181 by means of a union 49 which is screwed tightly up against the front plate 11 and serves to hold the air conduit sections iirmly in position. The pipe section 181 branches from the steam pipe 13 and has open communication therewith. Opposite the hole in each section is an air duct 51 which leads to the lire box and into which the discharge end 53 of the nozzle 19 projects. It often happens that the nozzles 19 are necessarily placed at varying distances from each other on the boiler plate because of obstructions or the like in the boiler. In order to provide for this contingency and to further add to the flexibility of the device, the enlarged portion 43 of a section is relatively long so that a comparatively large range of longitudinal adjustment is obtained. In this manner the sections may be arranged with the hole 46 in a position to receive a nozzle 19 under practically any conditions so that the sections do not have to be especially designed for each particular case, but may be of uniform design and produced in quantities at relatively small cost. By the construction described furthermore an air conduit of any desired length may be installed and secured firmly against the inside of the boiler plate 11 without making it necessary to tap holes for supporting means such as bolts or the like.

The end section 40 has an opening 54 for the passage of air which registers with a hole 55 in the boiler plate 11 over which an air box 56 having an open face is secured with its open face adjacent the plate. The air box 56 is preferably of the shape shown and has an upper open end 57. Air enters the box 56 through the open top 57 and thence passes through the open side adjacent the plate 11 and through the hole 55 in plate 11 and through hole 54, into the conduit 40.

Means are provided for closing the opening 57 in the air box to prevent the passage of air when the smoke preventer is not in operation which consists of a damper 58 mounted on a cylinder 59 and having guides 182 adapted to slide in guide members. lVithin the cylinder 59 a piston 60 is received which is secured to a hollow stem 617 the piston 60 being provided with a hole longitudinally therethrough which communicates with the passage 62 in the hollow stem. A horizontal pipe 63 to whichl the hollow stem 61 is secured is located transversely of the box 56 and connected with the steam pipe 13 by means of a pipe 64. The hole in the piston 60 admits pressure from the pipe 13 by way of the pipes 64 and 63 and the stem 61 to the interior of the cylinder. A. flange 65 on the lower end of the cylinder loosely ts about the stein 61 and is adapted to engage with the piston. By this construction it will be seen that the cylinder to which the damper is secured will move upwardly and open the damper when steam pressure is admitted to the pipe 13 through the valve 14 and will hold the damper open so long as the steam pressure continues. lhen the valve 14 is closed the pressure will be removed and the damper will fall and close the opening tothe air box.

AIn Fig. 4 I have shown an air conduit which is arranged to be employed in connection with five nozzles and consists ofv sections 70, 71, 72 and 73 and of varying lengths, three of which are provided with one hole and the other of which is provided with a pair of holes.y I find this arrangement is important for in many instances it is necessary to place the nozzles closely together and this construction together with the slip joint connections described gives quite a range of adjustment and renders it possible to use the stock sections in practically every instance.V

There as many as live nozzles are employed I prefer to use two air boxes one at each end of the furnace front in order to provide for the passage of suflicient air.

I regard my invention as important for by constructing the conduit in sections and by slip ointing them together and supporting them on the nozzles at the innerside of the front plate of the furnace a iiexible device is produced which is readily adapted to be applied to any type of furnace and which may be produced at a relatively small cost.

What I claim is:

l. In a smoke preventer for boiler furnaces, van air conduit consisting of a plurality of sections slip-jointed together and arranged t0 be adjustable longitudinally thereof, each of said sections having an exit opening into the interior of the furnace, aV

nozzle mounted in each of said conduit sections and extending into the said exit opening, and means for supplying fluid to each of said nozzles.

2. In a smoke preventer for boiler furnaces, an air conduit consisting of a plurality of sections slip-jointed together and arranged to be adjustable longitudinally thereof, each of said sections having an exit opening to the interior of the furnace, a nozzle mounted in each of said conduit sections and extending into the exit opening from said conduit, means for supplying fluid to each of said nozzles, means for supplying outside air to said conduit, a fluid controlled damper which controls the opening and closing of the supply of air to said conduit, and means whereby fluid is supplied to open said damper simultaneously With the admission of fluid to said nozzles.

3. In a smoke preventer for a boiler furnace, a furnace front plate, an air conduit on the inner side of said front plate, said air conduit consisting of a plurality of sections having slip joint connection with each other, each of said sections having an outlet communication With the interior of the furnace, a fluid supply pipe on the outside of the furnace, a plurality of branch pipes leading therefrom, said furnace front plate and said conduit sections being provided with holes through Which said branch pipes pass, said several conduit sections being secured to said fluid supply pipes Where the pipes enter said conduit sections, and a nozzle for each of said conduit sections having one end secured Within the hole in the side of said section With which the said supply pipe is connected and the discharge end of said nozzle extending into said outlet conimunication with the interior of the furnace, the slip joint connection of the air conduit sections being so arranged as to permit a longitudinal adjustment thereof to accommodate the desired positions of the fluidsupply pipes and nozzles in relation to the air conduit.

. 4. In a smoke preventer for a boiler furnace, a furnace front plate, an air conduit on the inner side of said front plate, said air conduit consisting of a plurality of sections having slip joint connection with each other, each of said sections having an outlet communication With the interior of the furnace, fluid supply pipes leading from the outside of said furnace to the interiors respectively of said conduit sections, said furnace front plate and said conduit sections being provided With holes to receive said .fluid supply pipes, and rnozzles connected With the holes in said conduit sections Where the fluid supply pipes enter, the discharge ends of said nozzles extending through said outlet communications of said conduit sections toward the interior of the furnace, the slip joint connection of the air conduit sections being so arranged as to permit a longitudinal adjustment thereof to accommodate the desired positions of the fluid supply pipes and nozzles in relation to the air conduit.

5. In a smoke preventer for a boiler furnace, a furnace front plate, an air conduit consisting of a plurality of sections slipjointed together and arranged to be adjustable longitudinally thereof, said conduit being located on the inner side of said front plate, each section having an air outlet to the interior of the furnace, fluid supply pipes extending through holes in said furnace front plate and into holes in the side of said conduit, opposite the air outlet, said front plate and said conduit sections each being provided with holes to receive said supply pipes, and nozzles connected With the holes in said conduit With which the iiuid supply pipe sections are connected and extending through the air outlet openings in the opposite side of said conduit.

6. In a smoke preventer for a boiler furnace, a furnace front plate, an air conduit consisting of a plurality of sections slipjointed together and arranged to be adjustable longitudinally thereof, said conduit being located on the inner side of the said front plate and having outlet communications With the interior of the furnace, iiuid supply pipes extending through said furnace front plate and through holes in the side of said conduit opposite the outlet coinniunication, said front plate and said conduit sections each being provided With holes to receive said supply pipes, and nozzles connected with the holes in said conduit with Which the fluid supply pipe sections are connected and extending through the opposite side of said conduit, some of said conduit sections being longer than others.

7. In a smoke preventer for a boiler furnace, a furnace front plate, an air conduit located on the inner side of said front plate and having an outlet communication With the interior of the furnace, an air box located on the outer side of said furnace front plate having a passage through said front plate to said conduit, a damper Which controls the admission of air to said air boX, a movable cylinder on which said damper is mounted, a piston in said cylinder, a hollow stem secured to said piston, a fluid sup- Aply pipe having a branch Which passes through the said furnace front plate into said conduit on the interior of the front plate, a nozzle connected With said pipe, the discharge end of said nozzle extending through the outlet 'from the air conduit into the interior of the furnace, said fluid supply pipe having another branch which enters the said outside air boX and is connected With said hollow stem and supplies fluid through said stem to said cylinder, and means Which controls the simultaneous admission of fluid to the said cylinder and to the nozzles, the fluid When admitted t0 the cylinder operating to open the damper to admit air to the outside air boX.

In testimony whereof I affix my signature.

BRADFORD L. AMES.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

